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Business combinations and disposals - Centacare (Details) - Centacare AUD in Millions, $ in Millions | Jan. 31, 2014 USD ($) | Jan. 31, 2014 AUD
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Preliminary Purchase Price Accounting |  |
Cash consideration | $ 2.7 | AUD 3.1
Deferred revenue | 0.5 |
Customer relationships |  |
Preliminary Purchase Price Accounting |  |
Intangible assets | $ 3.2 |
Amortization period of intangible assets | 4 years | 4 years

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